Method and apparatus for tensioning material



Spt. 3 93@ F, BGQELFQR Jg@ 1,776,775

METHOD AND APPARATUS vom Twsoums Mmmm@ fel April El, 192'? invention.

Patented sept. 3o, 1930 c- UNITED-'STATES FLORENCE c. EIGGERT, JE., 0E GRAFTON, PENNSYLVANIA, AssIeNoE 'ro UNITED EN'- GINEEEING e FOUNDEY COMPANY, oF rI'rTsBUEeH, rENNaYLVANrA, A coEroRA-- TION `0I PENNSYLVANIA METHOD AND APPARATUS ron 'rENsIoNINe MATERIAL Applieation'inee April 21,

The present invention relates broadly to the art of metal Working,.and more particularly to means for effectively feeding metal under conditions in which it is necessary to exert a considerable tension thereon without niarring the surface in any way.

In order to produce a yperfectly flat strip, it is necessary to exert tension on the nia'- ferial on the delivery side of the mill. Such tension has heretofore been accomplished by the use of a, tension coiler acting directly on the material as it leaves the mill. Such a tension coiler, While effectively exerting tension and thereby producing the desired fiattening action, is objectionable for the reason that ceiling finished material under tension invariably mars the same and thereby offsets, to at least a considerable extent, the advantages obtained by the tensioning operation. v

ln accordance with the present invention, 4 ll provide improved means for tensioning the material on the delivery side of the mill to produce a flat strip, irrespective of the final disposition of the material.

ln case it is desired to coil theflattened material as it leaves the tensioning means, the ceiling may be accomplished without any tension, thereby obviating the objectionable marring which has .heretofore occurred.

ln the accompanying drawings, there are shown for purposes of illustration only two different embodiments of the present invention, the illustration being largely diagrammatic, inasmuch as the details of construction, the arrangement of parts and the operation. thereof may be varied within wide limits kwithout departing from either the spirit of the invention orl the scope of the broader claims.

ln the drawings:

Figure l is a diagrammatic side elevational view of one embodiment of the invention; l 1' y Figure 2 is a detail sectionalview on the line IIII of Figure l;l and Figure 3 is a viev;7 similar to Figure 1, illustrating still another embodiment of the In the laccompanying drawings .I have l erly flattened material.

illustrated the invention in combination with the ceiling mechanism 2, although such coiling mechanism is not essential to the carrying out of the present invention and merely represents one means of disposing of prop- The'material M as PATENT it leaves the last stand on rolls 3 of afrolling mill and While still engaged by such rolls, passes toa tensioning means capable of acting thereon magnetically to produce the desired tensioning and flattening of the material withoutl scratching the same. y

ln theform of the invention shown in Fig;l nre l, this means comprises apair of endless flexible carriers 4 of similar construction located directly opposite each other on opposite sides of the material M. Each of the carriers 4 is provided with a series of magnets 5, vwhich magnets are adapted to engage the material onv opposite sides thereof and travel therewith while so engaged, as indicated clearly in- Figure l, and effectively hold the same against slippage. While the magnets may be energized continuously, if desired, I havefound that the operation is facilitated if'they are (le-energized at a station'A in their travel. At approximately this time, they have completed their feeding movement and are preparing to leave the material. Such an operation may be easily accomplished by providing brush contacts 6, for supplying the current to the magnets, which brush contacts` are so located that the magnets pass-out of' engagement therewith at or before the 'station' A is reached. y i

The endless carriers may be supportedv in any desired manner, should such-a construction be deemed necessary, by means of rolls 7 or the like, although the action of the magnets themselves` is such as to tend to maintain the carriers in the proper plane.v

In Figure 3 there is illustrated a slightly modified embodiment of the invention, in which the endless carriers are replaced by vmagnetic rolls 8 of any desired construction,

each pair of rolls serving both in the' capacity of pinch rolls and vfeeding rolls, whereby material within the magnetic vzone without possibility of lng been tensionedv an ner, the material may the material between the rolls tion of iclent tension of the rolls is elfectively prevented from sligping -relativelyjtheret o.

' y the use of magnetic. feeding. means of vthe, ,f general character herein disclosed, itis posslble to exert al greaterftension on the' material without fear of injury'thereto, and

mar-ring or otherwisel distorting the surface. f l

The advantages 4of the invention arise i from the provision of such a magnetic feeding means in conditions-under which tension l 1s desirable, and particularlywith highly finished surfaces. o In this manner it is possible to exert sufon the material leavin the mill to properly flatten the same and t 'ere by improve the qualit .material as it is and augmenting pulling by magnetism to preexertjthe. desired pull isreduced and thus avoid the danger of marring the materialby the'gripping' orce.

6, The method of tensioning material deliveredfrom a roll pass, comprising gripping the material at a plurality of points along the material and continuously7 pulling the. delivered from the roll pass,

vent slippage, whereby the ripping force required to exert the desired gull is reduced and thus avoid the danger of marring the material by the gripping force.

In testimony whereof I have hereunto set my hand.

FLORENCE C. BIGGERT, JR.

means in cooperative relation thereto, comprising meansy for gripping the opposite sides of the strip and exerting a pull on the port-hestrip between' the rolls and the tensioning means, and magnetic means included in the tension producing vmeans for augmentingthe pullvof the gripping means 4o 3. The. combination with a mill including a stand of rolls', of tension incoo'perative relation thereto, comprising means for gripping the material at a plurality of points spaced longitudinally thereof and exerting-a pull on the material between the rolls and the tensioning means, and magnetic means included in the tension producing means for augmenting the pull of the means l. Vra-lity of gripping means.

producing means 4 The combination with a mill including a stand of rolls, of tension producing means in cooperative relation thereto, comprising for gripping the material at a plupoints spaced longitudinally thereof while traveling therewith and exerting a pull on the material between the rolls and the tensioning means, and magnetic means included in 4the tension reducing means'for augmenting the pull o the grippmg means.

5. The method of tensioning material de livered'from a roll pass, comprlsing gripping and continuously ulling'the material as it is delivered from t e roll pass and augmenting theV ulling by magnetism to prevent slippage, w ereby the gripping force required to 

